Flash Flood Warning 32, NWS Sioux Falls, SD

197 
WGUS73 KFSD 051742
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1242 PM CDT FRI AUG 5 2011

SDC003-023-043-051900-
/O.CON.KFSD.FF.W.0032.000000T0000Z-110805T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS SD-CHARLES MIX SD-AURORA SD-
1242 PM CDT FRI AUG 5 2011

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTHWESTERN AURORA...
CENTRAL CHARLES MIX AND NORTHWESTERN DOUGLAS COUNTIES UNTIL 200 PM
CDT...

AT 1237 PM CDT...NATIONAL WEATHER SERVICE DOPPLER CONTINUED TO SHOW 
THUNDERSTORMS IN THE WARNER AREA.  HOWEVER...THE RAINFALL HAS BEEN 
BECOME LIGHTER RECENTLY.  EARLIER AT 11:45 AM CDT A WEATHER SPOTTER 
6 MILES EAST OF PLATTE REPORTED FOUR INCHES OF RAIN...WHICH CAUSED 
SOME FLOODING OF RURAL ROADS.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY.

&&

LAT...LON 4350 9887 4350 9880 4352 9879 4357 9858
      4330 9850 4318 9880 4349 9893

$$

HEITKAMP

586 
WGUS73 KFSD 051838
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
138 PM CDT FRI AUG 5 2011

SDC003-023-043-051850-
/O.CAN.KFSD.FF.W.0032.000000T0000Z-110805T1900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS SD-CHARLES MIX SD-AURORA SD-
138 PM CDT FRI AUG 5 2011

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHWESTERN
AURORA...CENTRAL CHARLES MIX AND NORTHWESTERN DOUGLAS COUNTIES IS
CANCELLED...

ANY ADDITIONAL RAINFALL THAT OCCURS WITH THE WEAKENING STORMS IS 
NOT EXPECTED TO CAUSE ANY ADDITIONAL PROBLEMS. THEREFORE...THE FLASH 
FLOOD WARNING IS CANCELLED. 


LAT...LON 4350 9887 4350 9880 4352 9879 4357 9858
      4330 9850 4318 9880 4349 9893

$$

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
945 AM CDT FRI AUG 5 2011

.DISCUSSION...
FOG FINALLY BURNING OFF WITH KFSD BEING ONE OF THE LAST LOCATIONS TO
IMPROVE.  THUNDERSTORM DEVELOPMENT IN SOUTH CENTRAL SHOULD DIMINISH
AND STORMS SHOULD DIURNALLY FALL APART.  GRIDS REFLECT THE CURRENT
SITUATION AND EXPECTED DISSIPATION.  MOST OF THE CONVECTION SHOULD
STAY TO THE SOUTH OF CWA AS SHORT WAVE PASSES THROUGH EASTERN
NEBRASKA TODAY.  BIGGEST QUESTION IS WHAT THE TEMPS WILL DO WITH THE
MORNING CLOUDS AND FOG.  ATTM...I WON'T BE TOUCHING THE HIGHS TOO
MUCH IN THE GRIDS AS TEMPS ARE EXPECTED TO REBOUND QUICKLY.  IT WILL
FEEL A LITTLE MORE HUMID TODAY WITH THE HIGHER DEW POINT AIR.

&&

.AVIATION...
AS CIGS AND VSBYS IMPROVE FROM MORNING FOG...REMAINDER OF THE TAF
TIME PERIOD SHOULD BE UNEVENTFUL EXCEPT FOR A FEW ISOLATED -SHRA
AROUND MISSOURI RIVER.  WILL NEED TO WATCH KSUX TAF TO SEE IF AN
UPDATE WILL BE NECESSARY WITH POSSIBLE DEVELOPMENT.  VFR WEATHER IS
EXPECTED THROUGHOUT THE REMAINDER OF THE PERIOD.  MAY INTRODUCE A
FEW -SHRA/-TSRA IN KHON TAF LATE IN THE PERIOD OF 18Z TAF ISSUANCE
BUT WILL TAKE A CLOSER LOOK BEFORE ISSUANCE.  MAY NOT BE THAT
SIGNIFICANT CHANCE TO MENTION.

&&

.PREV DISCUSSION...
ANOTHER SHORTWAVE TRACKING THROUGH NEBRASKA IS TRIGGERING CONVECTION
OVER THE CENTRAL PORTIONS OF THAT STATE VERY EARLY THIS
MORNING...AND LIKE YESTERDAY CANNOT RULE OUT THE POSSIBILITY OF SOME
OF THIS ACTIVITY SCRAPING OUR FAR SOUTH TODAY AS THE FEATURE PUSHES
EASTWARD INTO IOWA BY AFTERNOON. EVEN SO...WOULD LOOK LIKE ONLY A
SLIGHT CHANCE OF POPS WITH BEST INSTABILITY AND FORCING REMAINING TO
THE SOUTH OF OUR AREA. HIGH TEMPERATURES AGAIN LOOKING TO BE IN THE
80S...WITH COOLEST TEMPERATURES IN THE SOUTHEAST WHERE CLOUD COVER
WILL BE MOST ABUNDANT THROUGH THE DAY.

THETA E ADVECTION AND INSTABILITY REALLY CRANK UP TONIGHT OVER
WESTERN AND CENTRAL SOUTH DAKOTA WITH THE DEVELOPMENT OF A 30 TO 40
KT LOW LEVEL JET OVER THAT AREA...AND MAY SEE SOME OF THIS ACTIVITY
CREEP INTO OUR WESTERN ZONES LATE TONIGHT. WHILE COULD SEE AN
ISOLATED SEVERE STORM IN OUR FAR WEST...GENERALLY THINK ANY STORMS
THAT TRACK INTO OUR CWA WILL BE BELOW SEVERE LIMITS WITH WANING
INSTABILITY AND EFFECTIVE SHEAR IN PLACE OVER EASTERN SOUTH DAKOTA.
LOWS WILL BE IN THE MID AND UPPER 60S.

A BETTER CHANCE OF THUNDERSTORMS WILL COME ON SATURDAY INTO SATURDAY
EVENING AS A STRONG SHORTWAVE TRACKS ACROSS NORTH DAKOTA...PULLING A
SURFACE COLD FRONT ACROSS OUR AREA DURING THIS TIME FRAME. THE
BETTER CHANCES OF THUNDERSTORMS WILL REMAIN NORTH OF INTERSTATE
90...CLOSER TO BETTER FORCING TO OUR NORTH. INCREASING
CAPE/EFFECTIVE SHEAR/LAPSE RATES WILL CONTRIBUTE TO AN ENHANCED
CHANCE OF SEVERE STORMS OUT AHEAD OF THE FRONT ON SATURDAY
AFTERNOON...AS TEMPERATURES CLIMB INTO THE MID AND UPPER 80S.

COOLER AND DRIER CONDITIONS EXPECTED FOR SUNDAY AS HIGH PRESSURE
BUILDS INTO THE REGION. HIGHS WILL RANGE FROM THE UPPER 70S IN OUR
NORTHEASTERN ZONES TO MID 80S OVER SOUTH CENTRAL SOUTH DAKOTA.
PRECIPITATION CHANCES THEN INCREASE AGAIN ON SUNDAY NIGHT AND MONDAY
IN A RETURNING SOUTHERLY FLOW ON THE BACKSIDE OF THE HIGH AND
ANOTHER COLD FRONT SWINGING THROUGH THE REGION ON MONDAY NIGHT. THIS
WILL REINFORCE COOLER AIR ACROSS THE AREA...WITH HIGHS IN THE 70S TO
LOWER 80S FOR TUESDAY AND WEDNESDAY...WITH LOWS IN THE 50S TO LOWER
60S.  /JM

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1026 AM CDT FRI AUG 05 2011

SDZ038>040-050-052>071-MNZ071-072-080-081-089-090-097-098-
IAZ001>003-012>014-020>022-031-032-NEZ013-014-061200-
AURORA-BEADLE-BON HOMME-BROOKINGS-BRULE-BUENA VISTA IA-
CHARLES MIX-CHEROKEE IA-CLAY-CLAY IA-COTTONWOOD MN-DAKOTA NE-
DAVISON-DICKINSON IA-DIXON NE-DOUGLAS-GREGORY-HANSON-HUTCHINSON-
IDA IA-JACKSON MN-JERAULD-KINGSBURY-LAKE-LINCOLN-LINCOLN MN-
LYON IA-LYON MN-MCCOOK-MINER-MINNEHAHA-MOODY-MURRAY MN-NOBLES MN-
OBRIEN IA-OSCEOLA IA-PIPESTONE MN-PLYMOUTH IA-ROCK MN-SANBORN-
SIOUX IA-TURNER-UNION-WOODBURY IA-YANKTON-
1026 AM CDT FRI AUG 05 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST SOUTH DAKOTA...
SOUTHWEST MINNESOTA...NORTHWEST IOWA...AND NORTHEAST NEBRASKA.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS...
WIDELY SCATTERED THUNDERSTORMS WILL BE POSSIBLE TODAY IN AREAS
ALONG THE MISSOURI RIVER INTO PORTIONS OF NORTHWEST IOWA. THESE
STORMS ARE NOT EXPECTED TO BE SEVERE. A FEW MORE THUNDERSTORMS
MAY DEVELOP TONIGHT OVER CENTRAL SOUTH DAKOTA AND PUSH INTO THE
JAMES RIVER VALLEY LATE. THESE STORMS ARE ALSO NOT EXPECTED TO BE
SEVERE.

FLOODING...
MODERATE TO MAJOR FLOODING IS EXPECTED TO CONTINUE ON THE JAMES
RIVER UNTIL FURTHER NOTICE.

HIGH RELEASES ALONG THE MISSOURI RIVER WILL CONTINUE INTO LATE
SUMMER. HIGH WATER LEVELS WILL CAUSE SIGNIFICANT IMPACTS BETWEEN
CHAMBERLAIN AND SIOUX CITY. THE HIGH FLOWS ON THE MISSOURI RIVER
WILL ALSO CAUSE FLOODING ON THE BIG SIOUX RIVER NEAR SIOUX CITY.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED THUNDERSTORMS MAY DEVELOP ACROSS THE AREA ON SATURDAY
AS A COLD FRONT PUSHES THROUGH THE REGION. A FEW OF THESE STORMS
COULD BE SEVERE WITH LARGE HAIL AND DAMAGING WIND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT.

&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE AT
WWW.WEATHER.GOV/SIOUXFALLS. THIS INCLUDES THE GRAPHICAL HAZARDOUS
WEATHER OUTLOOK.